Update pyproject.toml

Goal: You currently have dependencies listed in both pyproject.toml and requirements.txt. These files are redundant and also conflicting (they list different things). This can cause confusion and versioning problems.

The Fix: We will make pyproject.toml the single source of truth by merging all dependencies into it and then deleting the old requirements.txt file.

I merged the two unique libraries from requirements.txt (gpiozero and spidev) into the dependencies list.

pyproject.toml

@@ -36,6 +36,8 @@ dependencies = [
     "adafruit-circuitpython-neopixel",
     "adafruit-circuitpython-neopixel-spi",
     "RPi.GPIO",
+    "gpiozero",
+    "spidev",
 ]
 
 [project.optional-dependencies]